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Mirrors > Home > MPE Home > Th. List > rexex | Structured version Visualization version GIF version |
Description: Restricted existence implies existence. (Contributed by NM, 11-Nov-1995.) |
Ref | Expression |
---|---|
rexex | ⊢ (∃𝑥 ∈ 𝐴 𝜑 → ∃𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rex 2918 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
2 | exsimpr 1796 | . 2 ⊢ (∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) → ∃𝑥𝜑) | |
3 | 1, 2 | sylbi 207 | 1 ⊢ (∃𝑥 ∈ 𝐴 𝜑 → ∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∃wex 1704 ∈ wcel 1990 ∃wrex 2913 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-rex 2918 |
This theorem is referenced by: reu3 3396 rmo2i 3527 dffo5 6376 nqerf 9752 supsrlem 9932 vdwmc2 15683 toprntopon 20729 isch3 28098 19.9d2rf 29318 volfiniune 30293 bnj594 30982 bnj1371 31097 bnj1374 31099 dfrdg4 32058 bj-0nelsngl 32959 bj-ccinftydisj 33100 poimirlem25 33434 mblfinlem3 33448 mblfinlem4 33449 clsk3nimkb 38338 stoweidlem57 40274 |
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